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Numerical study on the continuity factor and the limits between continuous and discontinuous behaviors
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.ORCID-id: 0000-0001-5628-9673
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.ORCID-id: 0000-0002-8152-6092
2012 (engelsk)Inngår i: ISRM International Symposium - EUROCK 2012, International Society for Rock Mechanics , 2012Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

 Discontinuum approach or equivalent continuum approach is usually adopted in order to model the behavior of rock masses. The latter approach is more frequently used. However, this approach might be unacceptable for slightly-jointed rock masses. The continuity factor (CF), mainly derived from empirical experience, is defined as the ratio of the tunnel span to the block diameter. It is commonly used to determine whether a rock mass should be modeled as a continuum or a discontinuum material. Only a few analyses regarding the CF have been performed previously. In order to study the limits between continuous and discontinuous behavior, nu-merical analyses with UDEC have been performed. In these analyse, a rock mass with two sets of orthogonal joints are initially generated. From this rock mass, square areas corresponding to a certain CF are randomly chosen as models in UDEC. Confined compression test is conducted on the mentioned model and the constrained modulus (Dm) regarding this rock mass is calculated. Due to the variations of the relative loca-tions between the square and the joints cut inside, as well as the joint quantity and the joint lengths, several Dm are yielded for each CF. Several CFs are also analyzed and the results are compared with previous suggested limits between continuous and dis-continuous behaviors.

sted, utgiver, år, opplag, sider
International Society for Rock Mechanics , 2012.
Emneord [en]
rock mass behavior, continuity factor, excavation, joint
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-138851Scopus ID: 2-s2.0-84901317828OAI: oai:DiVA.org:kth-138851DiVA, id: diva2:681851
Konferanse
2012 ISRM International Symposium - EUROCK 2012, Stockholm, 28 May 2012 through 30 May 2012
Merknad

QC 20220623

Tilgjengelig fra: 2013-12-20 Laget: 2013-12-20 Sist oppdatert: 2022-06-23bibliografisk kontrollert
Inngår i avhandling
1. The Use of the Continuity Factor as a Tool to Represent Representative Elementary Volume in Rock Engineering Design
Åpne denne publikasjonen i ny fane eller vindu >>The Use of the Continuity Factor as a Tool to Represent Representative Elementary Volume in Rock Engineering Design
2014 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2014
Serie
TRITA-JOB. LIC, ISSN 1650-951X ; 2025
Emneord
rock mass, scale effect, representative elementary volume, continuity factor
HSV kategori
Forskningsprogram
Byggvetenskap
Identifikatorer
urn:nbn:se:kth:diva-144591 (URN)
Presentation
2014-05-16, Sal B1, Brinellvägen 23, entreplan, KTH, Stockholm, 15:36 (engelsk)
Opponent
Veileder
Merknad

QC 20140428

Tilgjengelig fra: 2014-04-28 Laget: 2014-04-25 Sist oppdatert: 2022-06-23bibliografisk kontrollert

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